fix: stats By Continent donut totals now match the QSO count (bucket blank/unknown continents as 'Unknown' instead of dropping them; keep the Continents metric counting real continents only)

internal/qso/stats.go

@@ -392,8 +392,13 @@ func (r *Repo) Stats(ctx context.Context, from, to time.Time, contestID string,
 		if st := strings.ToUpper(strings.TrimSpace(station.String)); st != "" {
 			stationC[st]++
 		}
+		// Bucket a blank/unknown continent under "Unknown" rather than dropping it,
+		// so the continent breakdown totals the same as the QSO count (a handful of
+		// QSOs with no resolved continent made the donut read a few short).
 		if c := strings.ToUpper(strings.TrimSpace(cont.String)); c != "" {
 			contC[c]++
+		} else {
+			contC["Unknown"]++
 		}
 		if c := strings.TrimSpace(country.String); c != "" {
 			entityC[c]++
@@ -436,6 +441,9 @@ func (r *Repo) Stats(ctx context.Context, from, to time.Time, contestID string,
 	s.UniqueCalls = len(calls)
 	s.Entities = len(entities)
 	s.Continents = len(contC)
+	if _, ok := contC["Unknown"]; ok {
+		s.Continents-- // "Unknown" is a catch-all bucket, not a real continent
+	}
 	if !first.IsZero() {
 		s.FirstQSO = first.UTC().Format(time.RFC3339)
 		s.LastQSO = last.UTC().Format(time.RFC3339)